Valve-motion



(No Model.)

W. OAMERER.

Valve Motion.

Patented Oct. 12, I880.

NPEI'ERS, FHOTD-LITHOGRAFHER, WASHINGTON, D Q.

UNITED STATES PATENT OFFICE.

WILLIAM GAMERER, OF READING, PENNSYLVANIA.

VA LVE-MOTION.

SPECIFICATION formingpart of Letters Patent No. 233,201, dated October 12, 1880.

Application filed August 30, 1880.

To all whom it may concern:

Be it known that I, WILLIAM: OAMERER, a citizen of the United States, residing in Reading, Berks county, Pennsylvania, have invented an Improvement in Valve-Motions, of which the following is a specification.

My invention relates to an improvement in link-motions for operating the valves of locomotive-engines; and the object of my invention is to obtain an increased lead variation and a decreased throw variation of .the valves, an object which I attain in the manner hereinafter described, reference being had to the accompanying drawings, in which- Figure 1 shows my improved valve-motion, and Fig. 2 the same, exhibiting the parts in a different position.

A and A are the usual eccentricrods, adapted to two eccentrics on the driving-axle B, and connected to the link I) in the usual manner.

A lever, E, is pivoted to the frame of the engine at a, one arm, 0, of this lever carrying the blockf, in which the link is arranged to slide, and to the other arm, 0, is adapted a slide, it, which is connected by a rod, F, to the valve-spindle G at as, the said arm 6 being made in the arc of a circle, of which the point :12, when midway between the limits of its movement, is the center.

The slide-valve H is of the ordinary construction, and the steam and exhaust ports of the cylinder to which the valve is adapted are arranged in the ordinary manner.

The link is controlled by the usual reversing bar or lever I, which, in the present instance, is connected to the said link by an arm, t, of the said lever, and a link, j.

The position of the slide it on the segmental arm 6 of the lever E is also under the control of the reversing-bar I, the connection of the latter with the slide consisting, in the present instance, of a bell crank lever, K, pivoted to the frame, one arm of this lever being connected by a link, m, to the said slide, and the other arm by a link, a, to the arm z'of the reversing-bar; but these connections may also be varied without departing from the main features of my invention.

When the reversing-bar is in the position Fig. 1 the link will be in such a condition as to impart the greatest movement to the lever E, the slide it being at the same time at its (No model.)

least distance from the pivot a of the lever. While this position of the slide it tends to decrease the throw of the valve this tendency is more than counteracted by the position of the link; hence when the parts are in this posisition the valve will have diminished throw and no lead, and may even have lap, and this is the condition of affairs when the engine is started. v

On moving the reversing-bar to the position indicated by the line to in Fig. 1, and shown in Fig. 2, the link will have been moved to a position where the eccentrics will impart the least motion to the lever E, and the slide it will have been moved outward from the pivot a to its full extent. When the slide it has been moved to this position there will be two influences at work, one due to the increased distance of the slide from the pivot a, and tending to increase the throw of the valve, the other being due to the position of the link, and tending to diminish the throw of the valve, and the latter influence prevails over the former. Owing to these circumstances the valve will have the greatest lead when the reversing-lever is on the line a", and the lead will decrease as the lever is moved, either in one direction to hack the engine or in the other direction for causing the engine to move ahead. The same efi'ect is produced, to a limited extent, by the ordinary link-motion in the absence of my improvements; but by the latter I am enabled to obtain such an increased lead variation and decreased throw variation of the valve as cannot be attained by the common link-motion, a result the advantages of which will be understood by all who are familiar with locomotive engineering.

I claim as my invention The combination of the link connected to the eccentrics, and the lever E and its adjustable slide, connected to the valve-spindle, with the reversing-bar I, and with mechanism whereby the said link and slide may be operated simultaneously by the bar, as set forth.

In testimony whereof I have signed my name to this specification in the presence Oftco two subscribing witnesses.

WILLIAM OAMERER.

Witnesses:

J Arms F. TOBIN, HARRY SMITH. 

